带有和没有离子的达普托米辛寡合体的时间分辨率原子成像和统计分析
Takayuki Nakamuro1, Ko Kamei1, Keyi Sun1
1Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|July 20, 2022
概括
达普托米辛 (DP) 分子在水中自然形成小聚合物,离子显著增强这种聚合. 这项研究揭示了DP寡合体的结构,这对于了解其对抗耐药细菌的机制至关重要.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 达普托米辛 (DP) 是一种对抗药物耐药性格拉姆阳性细菌的重要抗生素.
- 它的机制涉及 (Ca2+) 触发的聚合,但它的分子结构仍然不太清楚.
- 之前的研究没有提供DP聚合的分子水平结构见解.
研究的目的:
- 为了研究DP在水溶液中的自我聚合.
- 为了确定Ca2+对DP聚合和寡合体形成的影响.
- 阐明DP寡合体的分子连接性和结构.
主要方法:
- 在水中进行动态光散射以研究聚合.
- 使用传输电子显微镜 (TEM) 的原子分辨率电影成像.
- DP分子被固定在碳纳米管上进行成像.
主要成果:
- 在水中,DP分子表现出较弱的聚合成二次体,三次体和四次体.
- Ca2+强烈促进DP聚合,四聚体是溶液中观察到的最大的寡聚体.
- 一个面对面堆叠的结构被提出主要的二度物种基于毫秒/安格斯特罗姆分辨率TEM.
- 观察到线性三分体和周期四分体.
结论:
- DP具有在水中形成四度体的内在倾向,由Ca2+增强.
- 这项研究为DP寡合体提供了第一个实验性结构见解.
- 这些发现为未来基于达普素的药物设计提供了一个平台,并突出了用于自我组织研究的先进成像技术.
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